diff --git a/app/Services/Analytics/Contracts/DataSet.php b/app/Services/Analytics/Contracts/DataSet.php
new file mode 100644
index 0000000..40e08b1
--- /dev/null
+++ b/app/Services/Analytics/Contracts/DataSet.php
@@ -0,0 +1,31 @@
+<?php
+
+namespace App\Services\Analytics\Contracts;
+
+use App\Services\Analytics\AnalyticsQuery;
+use App\Services\Analytics\AnalyticsResult;
+
+interface DataSet
+{
+    public function key(): string;
+
+    public function label(): string;
+
+    public function description(): string;
+
+    public function category(): string;
+
+    /** Фиксированный отчёт (предопределённые колонки, без выбора группировок/показателей). */
+    public function fixed(): bool;
+
+    /** @return \App\Services\Analytics\Dimension[] */
+    public function dimensions(): array;
+
+    /** @return \App\Services\Analytics\Measure[] */
+    public function measures(): array;
+
+    /** @return \App\Services\Analytics\FilterDef[] */
+    public function filters(): array;
+
+    public function run(AnalyticsQuery $query): AnalyticsResult;
+}